This is a great BBC series on the political rivalry between the two post-WWII superpowers (the USA and the USSR) and its role in motivating and guiding the space programs of the two countries. At the heart of this rivalry between the two nations, there was a rivalry between two men (Verner von Braun and Sergei Korolyov), which was shaped by their bizarre life circumstances, visionary outlooks on life, and strong personalities. This documentary is great in that it places the saga of space exploration in its historical context and puts a very human face to it. I hope you enjoy the episodes of these series. I certainly have.